Does a `using` Statement Automatically Close an Open SQL Connection?

Does End Using Close an Open SQL Connection?

When utilizing a SqlConnection within a using statement, the question arises whether an explicit Close operation is necessary after executing the statement block.

Answer:

The using statement handles closing the connection. Exiting a using block triggers the .Dispose() method on the enclosed object, in this case, cn, the SqlConnection object. This process closes the connection and any associated open resources.

In the provided code sample:

using cn as new system.data.sqlclient.sqlconnection()
    cn.open
    '{do a bunch of other stuff with commands and datareaders here}
    cn.close 'Do I need this?
end using

The cn.close line is redundant. The using statement will automatically close the connection upon exiting the statement block, making the explicit Close operation unnecessary.

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